I have a problem with fur rendering. I made a small grass plane. A character is in front of the grass. The camera starts between the two. You see the back of the character. Then the camera starts rotating around the character. When the grass is almost visible the whole background is colored in the colors of my grass. Looks like some strange artifacts. Does anyone have a clue? GBS

Fur is a post effect, isn't it? So it likely has a bug that affects the entire background. As a practical matter, you shouldn't be using a solid background unless you plan to cut it out of the final render, and this probably isn't affecting your alpha (I'm guessing), so there shouldn't be any problems — you won't see the background anyway. Quick solution: put some geometry in for the background. If you don't want it to be visible, give it a Matte material that doesn't receive shadows.